I've been on MobileMe for years now, and love that it could automatically sync calendars on my iPhone, iPad and computers, even to where I could access my calendar (and contacts, lest I forget) from any Web browser in the world. Very handy for someone who lives and dies by his calendar. Now there's a new player in town, iCloud, and it's a mandatory upgrade for all MobileMe users.
How can you most easily upgrade your MobileMe account to iCloud?